Oh well, I did say you had nothing to lose... hoovering is best done in conjunction with a stiff bristled brush to dislodge the solidified dust. I've done it countless times to overheating PC cases and PSUs but normally blast them with a compressed airline with a trigger nozzle attached at a local garage, nothing can cling on under that amount of air movement 
Have you got it working again and was it just a mobo battery?
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Current:
99 Subaru Forester S-Turbo Auto - interesting... but it's not a quattro
91 Reliant Scimitar SST 1400 - no.39 of 42... something for the weekend
Previous:
Two consecutive 1989 Audi 200 Quattro Turbo Avant, 1B
1990 Audi 100 SE Avant, NF
1986 Audi 100 CD Avant, KU
1987 VW Passat GL5E Estate, JS
"Honorary" triple member of the 200,000+ Club 
Audi 200 in the UK (legacy website)
Classic Audi member no: 258
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