Repair facilities may charge for certain miscellaneous supplies, such as rags, cleaning fluids, lubricants, etc., or for the disposal of hazardous waste materials. The charge for these items must be included in the estimate given to the customer before repairs are started. The charge should never show up "by surprise" on the customer's final bill, even if it is only 10% or $50 (whichever is less) of the original estimate. Some estimate forms have a printed note which sets a certain percentage for shop supplies. Even if there is such a note, the price quote on the written estimate must still include the actual dollar amount which will be charged.