. . ..
(seller's name and business street address)
The notice must be postmarked before midnight of the seventh day exclusive of Saturday, Sunday, and holidays after you sign the contract.
The seller shall return all deposits and payments within ten days after receipt of your cancellation notice.
You must make available to the seller all equipment, products, and supplies provided by the seller within ten days after receipt of all refunded deposits and payments."
RCW 19.110.110