[gr cleaning solutions]

Hi all im after some advice please i have been asked by my window cleaning customers if I do power washing drive ways etc . Always one to expand my business im looking into it .
   1   should I  use a  petrol machine
   2   do you use your own water or the customers outside tap
   3   do you price per hour or price per square metre
   
  i have been looking at a pro user  5.5 hp  petrol washer are these any good for starters           
                              many thanks Gavin 

[BDCS]

Search old threads as all of these questions have been covered so many times and quite recently but
1 yes or diesel
2 customers always
3 £3.50 mtr blocked and £2 slabs etc
 and thats pants - 13 hp needed min