Some solvents can take the anodizing off aluminum and potentially attack plastic.
Strong acids & bases might affect anodizing but normal solvents shouldn't. The only chemicals on my compatibility charts that are not recommended for Aluminium are inorganic ones.
However over 90% of the solvents in our lab will affect one plastic or another.
There are a few plastics that are effectively immune to solvent attack, (PTFE, PFA, PEEK...) but use of these in camera parts manufacture will probably be limited to PTFE being used for self lubricating parts.
On the whole construction is more likely to involve plastics/elastomers like Nylon, polycarbonate, polystyrene, rubber, & silicone the last 2 of which are severely affected by nearly all hydrocarbons (gasoline etc), while ketones & alcohols will generally go for the others.