Challenger Captain reported while being deiced; starting the engines and adding power resulted in the aircraft skidding. The flight crew was able to regain control of the aircraft.

Narrative

Upon getting deiced at FBO.. We became preoccupied with making sure the area behind our aircraft was clear; so as to be able to bring the engines out of idle as prescribed by the checklist. This necessitated a block out of parking slot to in order to continue with the post deice ( engines running ) checklist… the checklist does not state not to accomplish this check on slick or contaminated surfaces which was the case at the FBO ramp.. Obviously this should be common sense but that morning I must have left that part of my brain back at the hotel. Upon power application the aircraft immediately started to skid and since the nose steering was not on.. We had no direction control.. It was the quick thinking of my partner who armed the nose steering during this skid ; that we regained directional control…The thrust levers went to immediate idle upon losing traction but the aircraft had already started to slide to left and forward. Suggestions: The checklist should have a notice of avoiding higher than idle thrust on any slick surfaces and should an option to taxi to a non-contaminated surface to complete the check list.