Caring for Bioceramic: Scratches, Marks and Cleaning
A MoonSwatch gets treated the way few watches do. It is light, it costs a fraction of what the Speedmaster it references costs, and most owners wear it everywhere without a second thought — the right attitude, provided you know what the case will shrug off and what it will not. Bioceramic is harder than the word suggests, yet it marks in ways steel never does, and the crystal is softer than anyone expects. A sensible rotation from our straps for the Omega x Swatch MoonSwatch range protects the case better than any polish, because most of the marks a MoonSwatch picks up come from the band rather than from the world.
What Bioceramic actually is
Ceramic held in a bio-sourced matrix
Swatch's Bioceramic is roughly two-thirds ceramic powder and one-third plastic derived from castor oil, moulded into a single body. That explains most of how it behaves. The ceramic gives it a hardness and a dry, chalky feel that plastic alone does not have, while the polymer means it is not brittle the way a sintered ceramic case is — a MoonSwatch dropped on a tiled floor usually survives where a full ceramic watch would chip.
Why the finish matters more than the material
The surface is matte rather than polished, and that is the key practical point. A matte finish hides fine scratches far better than a glossy one, but it cannot be restored. On steel you can brush or polish a mark away; on Bioceramic any abrasive attempt leaves a shiny patch that catches the light and looks worse than the original mark from every angle. Case care comes down to that asymmetry — cleaning is easy, correction is impossible.
Three kinds of mark, and which ones come off
Transfer marks: almost always removable
Most of what looks like damage is not damage. Dye from dark denim, pigment from a leather jacket cuff, graphite, biro, the rubber of a desk mat — all of it sits on the surface rather than in it, and a damp cloth with a drop of soap takes most of it off. If light pressure does not work, a cotton bud worked into the texture will. Try this before concluding that a case is scratched: on light-coloured cases it accounts for most complaints.
Scuffs: usually invisible once clean
A scuff is material left behind by whatever you brushed against — a door frame, a kerb, the edge of a laptop. On a white or grey case it reads as a grey streak and looks alarming, but the Bioceramic underneath is usually untouched.
Scratches: permanent, and that is that
A genuine scratch has removed material, and on a matte case nothing brings it back. Fine ones disappear into the texture within a week of normal wear and become very hard to find again; a deeper one on the bezel edge will stay visible, and there is no safe fix. Polishing compound, melamine sponges and abrasive creams all make the area glossy, which draws the eye to exactly the spot you were trying to hide.
The cleaning routine, in two minutes
What it needs, and how often
Lukewarm water, a drop of mild washing-up liquid, a soft toothbrush and a microfibre cloth. Once a fortnight is ample for everyday wear. Take the strap off first if you can — the lug gaps and the area around the spring bar holes collect more than the rest of the case combined, and you cannot reach them with the band fitted. Brush gently all over, paying attention to the knurled bezel edge and the pushers, rinse under a running tap, then dry the watch fully.
Remember what three bar means
The MoonSwatch is rated to 3 bar: rain, hand-washing and a brief rinse under a tap. It does not cover a strong jet or a soak in hot water, which asks more of the gasket than it was designed to give. Keep the rinse short and lukewarm, and dry the case back and lug area rather than leaving moisture trapped between case and strap.
After sand, salt or sun cream
These three are the real enemies, and not because they attack the material. Sand is abrasive and collects in the lug gaps, where the strap drags it across the case all day — that is how the lug flanks of a beach-worn MoonSwatch end up dulled. Salt does the same on a smaller scale, and sun cream leaves a film that holds both in place. Rinse after a day at the coast, every time.
The crystal is the soft part
The glass is plastic rather than sapphire or mineral, a deliberate nod to the Hesalite crystal of the original Speedmaster Professional. It scratches easily — a sleeve button or a careless pass against a wall is enough — and it is also the one component that can be genuinely restored. A paste of the kind sold for acrylic watch crystals, worked in with a cotton cloth in small circles, removes light scratches entirely in about five minutes. Keep it off the Bioceramic, which it will gloss, and mask the case edge with tape before you start.
Where the marks actually come from
Track down the source of most case wear and it is the strap. Grit trapped under the band or in the lug gaps acts as sandpaper with every wrist movement. Dark leather transfers dye to a light case, particularly in summer when sweat carries the pigment — a vegetable-tanned or unlined band will do this for its first few weeks, so if you are wearing one of our leather straps for the MoonSwatch on a white or grey case, wipe the lug area down for the first fortnight and the problem resolves itself. And a steel bracelet with badly finished end links will rub the lug flanks every day it is worn.
Textile has the opposite profile: a woven band transfers almost no dye and sits softly against the case, but it holds grit in the weave and releases very little of it on its own. The fix is to wash the band whenever you clean the watch, which is no trouble, since canvas straps for the MoonSwatch take a hand wash as often as you like. Rotating two or three bands helps more than any single precaution, because none stays on long enough to work its own kind of damage into the case.
Changing straps without marking the lugs
More cases are marked during a strap change than during a year of wear, and nearly always the same way: a spring bar tool slipping off the bar and skating across the lug. Work on a towel so the watch cannot slide, approach the bar from the outside of the lug with the forked end flat against it rather than angled into the case, and never lever a strap out of the gap. Compress the bar fully, then lift the strap straight up. If it will not come free, the bar is not fully compressed, and force at that point is how a lug flank gets a bright scar across it.
What to keep well away
Alcohol gel and antibacterial wipes, which leave the matte surface patchy and chalky. Acetone, white spirit and bleach, which attack the polymer binding the ceramic. Abrasive cream, melamine sponges and toothpaste, which gloss the finish permanently. Ultrasonic cleaners, which drive water past a 3 bar gasket. And heat: Bioceramic softens at temperatures a full ceramic case would ignore, so a dashboard in summer is a genuine risk, and a case that has warped will never sit straight again.
Frequently asked questions
Can a scratch be polished out of a Bioceramic case?
No. Abrasives leave a glossy patch on a matte surface, more visible than the scratch was. Clean the mark first — much apparent scratching is transferred material that comes off with soap.
Is the MoonSwatch safe in the shower?
Briefly and occasionally, yes, but it is not a good habit. Hot water and soap are harder on a gasket than cold water, and 3 bar leaves little margin.
My white case has gone grey around the lugs. Is it ruined?
Almost certainly not. That area traps grit and strap residue, and a soft toothbrush with soapy water usually restores it. Remove the strap to reach it properly.
Can I polish the plastic crystal myself?
Yes, and it is the one part you can genuinely restore. Use a paste made for acrylic crystals, keep it off the case, and work in small circles with light pressure.
Does a NATO band protect the case back?
It covers it, which helps against desk marks, but it also holds grit against the case. The protection is real only if the band is washed regularly.
Two minutes a fortnight
Bioceramic asks very little: lukewarm water, mild soap, a soft brush, and the discipline never to put anything abrasive near it. What it will not forgive is an attempt at correction, so the whole game is keeping marks off in the first place — and since most of them arrive by way of the strap, the lug gaps are where attention pays. A MoonSwatch that still looks right after three years is rarely the one that was treated delicately; it is the one that was cleaned regularly.
Also read our previous article: Curved End vs Straight End: What Fits a Bioceramic Case