Help needed with my Yashica mat 124

[Laurent]

I dried the alcohol before screwing the rear lens element in place, the camera operates like a charm since I cleaned the blades

[mgb74]

Zippo fluid (cig lighter fluid) is safer then alcohol there is less water in Zippo fluid.

Different alcohols will have varying amounts of water. Common rubbing alcohol tends to have the most water of all the readily available (non lab grade) types. Perhaps all have more water than lighter fluid - I don't know.