41. Denatured alcohol is not, in itself, a product that would be normally demanded if given the alternative of normal ethanol.42. That done, thank you, you can clean off the sap with rubbing alcohol or denatured alcohol , which will dissolve it harmlessly. 43. Mix 1 part of shellac with 4 parts of denatured alcohol and brush the mixture on the surface, following the grain. 44. Denatured alcohol is volatile so keep it away from an open flame and make sure your work area is well ventilated.45. To identify clear finish, rub a cotton swab dampened with denatured alcohol over one or two square inches in an inconspicuous spot. 46. A . Rubbing alcohol or denatured alcohol will dissolve the sap, both on wood decks and softer materials such as umbrella canvases. 47. If you have a lot of marks, use denatured alcohol , sold in hardware and paint stores; it is less expensive and smells better. 48. Use a diluted mixture of two parts shellac to one part denatured alcohol and brush on two coats with a flat sable brush. 49. A . For the sticky stuff, try scrubbing the screens with denatured alcohol ; I think it is resin from pines or other evergreens. 50. :" Alcohol perfume " is basically grain alcohol ( 190 proof ) . " Alchohol denat " is short for " denatured alcohol ".