Depends if your company de-icing manual approves 1-step de-icing. If yes, you can choose to both have the contamination removed & the anti-icing added by one application of Type II or IV. However, since rehydration nearly always will be greater if using a one-step procedure, there might be combinations of contamination & moderate/heavy precipitation where you might go for a two-step procedure none the less.
...errr, I think...
Brgds
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