wash their pipe under a tap after every use

California wine moms got this part right. If you clean your glass every time you use it, your flower/concentrate/whatever will always taste better (and you won't have to taste the bouquet of ashes and whatever microbiota grow in there) when you smoke or vaporize. I say this as a stoner who used to clean their water pipes with isopropyl and salt at the end of any day they were used. I only vaporize now, but I still clean my dynavap regularly.