Yeah, they'll be full of Limescale most likely, which will dry then flake off. If they can come out easily enough, maybe make a little water feature in the garden or something?
Also, don't take the cylinder to the tip, you'll get maybe...
I'd describe that as a sub-DIY level job to be honest. No care has been take there whatsoever.
Plastic always looks rubbish where it's exposed, especially heating pipes which get hot, then go softer, then sag/contort. I installed a rad...