@jimbob: i've tried (a very hundreds of time
) with or without trapdoor cover... but you have the ECS with the "fix" too??
@kipper2k: i've used the spray and a "cotton fioc", but the A600 was no as oxidated as you think, it's in a very good state for a 20's years old! Anyway, i'll try a more "heavy" cleaning... what's about a pen rubber?