Mirror Washing at Kitt Peak
~75 ml. Orvus WA Paste (sodium lauryl sulphate) in 5 liters deionized water (in a plastic garden sprayer)
Use prepared natural sponges
CO2 snow first (if possible), spray DI H2O second to remove largest particles
Spray on soap solution and then gently drag the well wetted natural sponge over the surface to dislodge remaining particles