Question

[🪦 PREMATURE INKER ●]

The yellowing is probably a paint problem in which you cannot just clean off.You probbaly can have it repainted if that is what you need...On the other hand it could be a dirt problem where there has been too much dust o it which can turn brownish yellow over time and in that case I would use warm water on a cotton cloth to wipe it down..you can also use mild sopa but please don't scrub too heavily.J-