From Consumer Wiki
Door-to-Door sales or solicitation for sales allow a three-day cancellation, or cooling off period and apply to purchases of $25 or more including interest, mailing, and other charges that take place away from a normal business place, such as in your home or at a seminar sale program.
The three-day cancellation right applies only to items or services purchased for personal, family, or household use. Sundays and holidays are not counted in the three day cancellation time.
Cancellation occurs when the buyer gives written notice of cancellation to the seller at the address specified in the agreement or offer. Notice of cancellation, if given by mail, is effective when deposited in the mail properly addressed with postage prepaid. Notice of cancellation given by the buyer need not take the particular form as provided with the contract or offer to purchase and, however, expressed, is effective if it indicates the intention of the buyer not to be bound by the home solicitation contract or offer.
* Solicitors must be licensed by the city or county in which the sales are made. Ask to see the salesperson's personal identification and if required, license or registration. Salespersons are required to give you his or her name, the name of the company and product when he or she first comes to the door.
* Ask for sales literature and then call local stores that might sell the same merchandise to compare prices. Some door-to-door products may be overpriced.
* Avoid being pressured into buying. Watch for the warning signs: an offer of a free gift if you buy a product, an offer that is good for that day only, or the consumer is told a neighbor just made a purchase.
Department Publications: Fact Sheet "Be Smart. . . Buy Smart What Shoppers Should Know About Door-to-Door Sales"
Other References: Consumer Transactions with Statutory Contract-Cancellation Rights
See Also: Civil Code § 1689.5 - 1689.7, Consumer Transactions with Statutory Contra-Cancellation Rights
Other Referrals: Attorney General, Better Business Bureau, Local Consumer Protection Agencies, District Attorney, and Small Claims Court</p>