My 1/72 Lancaster fuselage now has 38 masks excluding canopies and gun turrets (but including 30 side windows!) During sanding and masking it has been well-handled with greasy hand prints all over it which could make it difficult for the primer to stick. I can't wash it with soapy water because of the masks, so what would the best way to clean it? Perhaps using a cotton bud and that alcohol that chemists sell ("Rubbing Alcohol"?); that unused bottle of vodka in the cupboard?; meths? (Soapy water might be difficult to wipe off which is why a non eating plastic solvent might be better.) What do you think?