+1

But, my variation is a last wash in *very* dilute dishwash detergent (or Photoflo) solution, say about one drop a litre...

Also, while good for single-layer screens like the OP's, it shouildn't be used on compound screens which are combined with a condensor (at least, without dismanteling them - Nikon F/F2, for example).


Mirrors: the drastic solution is supposed to be to brush on a collodial solution, let dry and peel off...
NOTE!!! I haven't actually tried this (yet - mainly due to difficulty finding collodial solution). YMMV!!! Try on a junk camera first - I warned you!!

Now how about a thread now on the "extreme difficulty" of finding substitutes for mercury cells?