Anyone know how to clean these white spots on an old Arri Matte box?

[Paulo Arellano]

Anyone know how to clean these white spots on an old Arri Matte box?

[Mark Dunn]

Could be mould, in which case a mould cleaner might do it, or corrosion, in which case a rub-down and repaint may be in order. I'd try a domestic spray cleaner first in case you get lucky.

It wouldn't affect the function much, but I'm with you, a tidy up is in order.

Edited August 14 by Mark Dunn