[kiba]

Most fiddling these days have to do with the printing surface being unclean. I also experienced issues with my X1C too.

But the most common problem is the surface is unclean(on both printers), and my soap to water formulation not being quite dialed in.

[Miraste]

What printing surface are you using? I use a PEI sheet that I clean with straight isopropyl alcohol, and I almost never have issues.

[kiba]

PEI smooth and textured. Isopropyl alcohol works until it doesn't. That is why it is recommended that you use warm water with soap. I suspect the ratio of water to soap isn't dialed in quite right in my case, but I haven't bother to fix it just yet.

Either that, or don't touch the surface with your bare hands.

[Miraste]

I can only speak anecdotally, but I've been using this sheet for ~4 years while only cleaning it with 90+% IPA, and I haven't seen any loss of adhesion. I expect to replace it due to scratches before I have any problems with the cleaning method.

[wisenull]

I think the problems arise from using glue on it.

If I only print PLA without glue, one wipe with IPA and it's clean.

Glue on the other hand, it really sticks and you need water and soap.

[gerdesj]

I always use IPA to clean the bed too.

I have once used glue for a very thin print with lots of intricate holes in it.