Other factors are has it flown in a NBC environment, are you landing back in one etc, as decontamination becomes a factor.
Nutty,
Most decontamination on leading surfaces would take place in flight via ablation and
most physical agents would be found on the underside picked up when the ac taxied through contamination on the airfield. If there was surface contamination, canopies, optics etc would be treated with something non corrosive. If Grimsby was about to get it, any decontam would be quick and dirty - the issue was decontaminating the area so the aircrew could get out and AR5 themselves to the HAS/COLPRO/UCP/HCP etc. That was where most effort was imagined. On the plus side, if things are about to go nuclear it's nearly all over. Excellent. Time to hit the NAAFI.