Just quote every job as if the whole lot is full. Some you win, some you lose. You mainly win.
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When canvassing for my old firm the price was £3 per metre emptied + £1 per m cleaned (wiped).
Have a wander round and get an approximate length (don't forget the little ones on porches and the like). If you're not sure exactly how long it all is.. add a little bit to be on the safe side.
Now I just work for lil old me - Tell my custies this is what I used to charge at a big firm then knock 30% off. custie thinks they've got a bargain and you'll be happy with the price.
Couple of rubble sacks from Sainsburys and happy days.
It's a dirty job but someones gotta do it (sings)
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+1 except just chuck the crap in their green bin.