thinking of cleaning kitchen canopy filters the service will be to supply filters (which will remain my property) and to pick up and replace each month for this i am thinking of charging £10 per filter + an agreed hire of filter price but am unsure whether this is the best way to charge also need advice on advertising this service and getting clients i would also require a 12 month contract which would state that if they stopped using me within 12 months they would have to buy the filters and pay a £100 charge or could cancel after 12months but filters would remain my property does this sound fair for both parties and have you any advice