@wombat....I use a Delkin loupe, which is great....and eclipse and sensor swabs. But first I use the Rocket Blower in hopes I can get the spots off the easy way. Hope this helps.
This is Kenzie "Pops", the fellow who recruited me to walk this year. He's been walking for 40 of the 41 years the walk has been going on. It's the 3rd longest running walk in the U.S.