to the Crosman manuals and schematics. Scroll down to model 70. As far as white substance, don't know what that would be. Use only Crosman Pell oil or non-detergent 30 weight motor oil, sparingly. A drop on the end of the co2 cart/ before putting in the gun helps also.
http://www.crosman.com/airguns/service/manuals/crosman-rifles
daveb
www.vintageairgun.com