While there, may as well ask if they have anyone that specializes in these, the metaphor here being that if you need knee surgery then you don't need a general practitioner doctor or a cancer doctor or a brain surgery doctor, you need a doctor that's a joint surgeon.

Just junk lying around, plastic crates, dirty old piss jugs(!)

Same goes for a nice plastic tub surround vs tile (like a high-quality one-piece insert, not some crap piece-mail glue-on).The good news is, there are sooo many choices.

OEM plastic or aftermarket?

I would recommend staying away from the big box or DIY sprayers (plastic body housings) as they are not meant to be used professionally and often cannot be repaired.  

And you need plastic with rock over it, so the water sheds away.

People with brain cancer are getting surgery from an eye doctor and wondering why it didn't work... or trying to get a reverse mortgage from me, I'm young and my clients tend to be young (reverse mortgages require you be 62 years old), I've never done one.

Then they started unfolding this big black plastic bag. 

Buy them a neutral rug for their kitchen and some plastic dots (not sure of their proper name) that go on the inside of their cabinets so they don't slam.

If you get this work done make sure to run the plastic waffle board up the wall as high as the ground level outside.