One of the challenges to pre-salting is the perception on the part of the customer that you are charging them for material that they don't yet need. On per pound, per ton, or per occurrence pricing structures the customer has difficulty comprehending the (proven) benefits of this practice.
However..... if you're charging a seasonal flat amount and deicing is included.... it's the ONLY way to go. Studies by DOT's all over the USA have proven that you can save as much as 30% in material costs for the season (as long as you apply the material properly and at the correct times).
Long winded answer to your question.....
Short Version..... yes, we do... and yes, it works.