Meet up at Channel Lurkerlounge?

[librarian]

Heiho,

sorry about your troubles.
Spraying some liquid stuff will always give opportunity of the liquid solving dust and wash the resulting smear exactly to where you don't want it to be. If I'd had read earlier into this topic I'd have suggested using compressed air (also available in cans, if you don't have an industrial-sized compressor around ^^).
Not that this'll help you now :-(