Hi LMC,
That's a real pain. What kind of blower you tried?
Rocket blowers seem to work way better than a blower brush (with brush removed). Would highly second Duncan's suggesting keep it try if possible, before using wet swab methods.
Don't use an aerosol!
Can remember a sending off a new Canon 5D body as the guy had used aerosol air and got propellant all over the sensor!...a real mess
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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