In new build cleans, they shouldn't be using the stuff, so you shouldn't be worrying there. If you end up cleaning out older properties....here is where you may come accross it, although if you are removing it ..... it would be because you are a builder and renavating the property.....or as Lynda mentioned, it is loose outside in the garden or somewhere. So you wouldn't touch it. Get council etc involved and contracharge any charges involved to the Invoice.
Regards
Tim