I think you answerd your own points Colin
"cos obviously running the truck is costly , noisy, uses a lot of water, still does not dry that qiuckly, and uses lots of different chemicals for various applications , spots, odour, bad stains etc draught marking urine to namer a few"
does the host remove, spots, odour, bad stains ect draft marking ,urine to name but a few
if you get my point
Geoff