I'm doing scheduled maintenance on a number of PA system amplifiers
located in a night club.

Normally these machines get a clean with compressed air and optional
paintbrush for stubborn fur balls.

Some clubs use smoke machines and this oily fluid frequently finds its
way in to equipment.

Is my best cleaning strategy for cleaning amps affected by this
problem to liberally wash the PCB with isopropanol and let them dry?

Removing the boards would have to be the only way I suppose as in-situ
cleaning, aside from creating problems with excess solvent, means the
underside of the board doesn't get done.

Optionally I can use methylated spirits (denatured ethanol) as a
cleaning solvent which is MUCH cheaper than isopropanol here although
probably not as effective in terms of removing oily residues.

Any feedback appreciated!

Cheers, Anton.