Cloudy water/tubing troubleshooting for loop refresh

[Napoleon]

I noticed a while ago my tubing was cloudy, but thought it was due to me 'blowing out' my loop at one point using my mouth. I'm flushing, making a new reservoir, and upgrading,and want to try to prevent this going forward. I also wonder if the radiators/components weren't clean enough.

The film is almost slightly waxy, I took a q-tip to it and it smears off but leaves residue

The loop was together for 13 month, although for the last 6 or so it has sat stagnant. It was clouded up prior to the usage stop. I didn't notice a performance hit, but my loop was pretty overkill. I noticed some debris clogging my heatkiller when I cleaned it out.

Here the info about what was used (pics attached)
Reservoir: homemade PVC pipe fittings, used PVC cement to weld
Radiators: homemade converted heatercores
Tubing: 1/2" ID clearlfex 60
Coolant: distilled water with silver kill coil
Waterblock: heatkiller 3.0 LT with copper baseplate
Pump: Swiftech MCP655

I'm planning to use most of the same parts with the exception of a newly plated nickel heatkiller 3.0 baseplate and a new smaller homemade PVC reservoir

I will be swapping to 2x 280mm Hardware Labs radiators once I finish my PWM fan controller. I have a mayhem blitz cleaning kit and new tubing I was planning to use on the new loop. I also have this in line filter I can run to try and clean it out.

Thanks for the help!

 

[Napoleon]

The reservoir brass hose barb looks like this, also a comparison of the copper baseplate and new nickel plated one

 

[Killerxp100]

Looks like your getting some minor corosion between metals. White gunk is probably plasticizer leaking out of the tubing.

I always run copper/brass in my loops, no nickel or silver & straight distilled with a few drops of ptn nuke. Copper blocks look close to new even after years of running, with 6-12 month draining and refilling schedule.