QUICK ANSWER
Try water first, then alcohol if the mark remains.
For marks on the Manta’s white back casing, Supernote says to start with a soft cloth dampened with water. If that does not work, its support guidance says alcohol can be used on the back. Supernote also suggests makeup remover for persistent lipstick residue.
If the yellow or reddish-brown color does not change after careful cleaning, it may be discoloration in the casing’s painted surface rather than removable dirt. Photograph it and contact Supernote instead of moving on to abrasives or stronger chemicals.
STEP 1
Look at the pattern on the white casing
A streak, fingerprint, cosmetic mark or patch matching something in a bag is more likely to be transferred material.
Color that follows the casing edges and will not wipe away may be discoloration in the painted finish.
If the mark follows the cover or its lining, inspect that material before putting the Manta back into it.
Marks beneath a folio or in the center of the back are less likely to be ordinary hand grime.
STEP 2
Follow Supernote’s casing-cleaning order
- Turn the Manta off and remove its folio.Check the whole white back and the casing edges in daylight.
- Use a soft cloth dampened with water.Wipe the marked area gently. Put water on the cloth, not onto the device, and keep moisture away from seams and ports.
- If water does not work, try a small amount of alcohol.This is Supernote’s published advice for the back casing. Apply it to the cloth and test a small, discreet area first.
- For lipstick residue, try makeup remover.Supernote specifically lists this for lipstick stuck to the back. Use only a small amount and wipe the area clean afterwards.
- Stop if the color does not change.Repeated rubbing is unlikely to reverse discoloration within the painted finish.
Owners have tried aggressive methods, but a mark disappearing does not mean the finish was left undamaged. Supernote’s own casing guidance starts with water and then alcohol. It does not recommend sanding or harsh solvents.
OWNER EVIDENCE
Some casing marks clean off. Reported yellowing often does not.
Owners describe black bag dye, cosmetics and everyday marks transferring to the white back. Those are the cases most likely to improve with Supernote’s cleaning sequence.
Other owners describe yellow or reddish-brown discoloration around the back and edges that remained after water, soap, alcohol or erasers. Some saw it beneath a folio or in areas they rarely touched. One owner reported that alcohol and an eraser made no difference. If your mark behaves like that, stronger cleaning is unlikely to be the answer.
A Supernote representative explained in owner discussions that the back combines a PC+ABS frame with a fiberglass center plate. The parts have a natural color mismatch, so they are painted to look uniform. Supernote said it had improved the paint formula for better stain resistance and was investigating support for affected owners.
SUPPORT
Contact Supernote when the casing remains yellow
Take clear photographs of the full back, affected edges and folio in daylight. Tell support when the color appeared, how the device was stored and exactly which cleaning steps you tried.
Owners report Supernote reviewing affected devices individually, and some say replacements were discussed or provided. That does not establish a blanket replacement policy, but it is a strong reason to contact support before attempting anything abrasive.
Read Supernote’s casing-cleaning guidance ↗PREVENTION
Reduce color transfer onto the white casing
- Use a case with a clean, colorfast lining.
- Keep the inside of the folio and laptop bag free from ink, cosmetics and loose dirt.
- Let sunscreen, hand cream and sanitizer dry before handling the Manta.
- Do not store the white casing against dyed leather or damp fabric for long periods.
- Remove the folio occasionally and check the areas it normally covers.
For the wider device picture, read our Supernote Manta evidence review. New owners can also use the Supernote setup guide to build a cleaner file and care routine from day one.
THE BOTTOM LINE
Clean surface marks. Report persistent casing discoloration.
Water, followed carefully by alcohol, may remove transferred marks from the white back. Yellowing that does not move is probably not ordinary dirt. Document it and let Supernote assess the casing rather than risking the painted finish with abrasives or stronger solvents.