In my history, gluesticks were the worst choice I ever made.
I was worried about adhesion issues w/ PETG, so I used some gluesticks (the purple one) and had complete lack of adhesion (literally rolling up onto the extruder instead of going onto the bed).
After that, I went and did a lot of alcohol+razor cleaning (keeping the razor at about a 10 degree tilt, and just scraping everything off in pretty much an alcohol bath).
I also went back to my tried and true setup for doing a “heated level” (note that this is just distilled knowledge from @tone, @brent113, and @MooseJuice’s and many others from around this forum) :
Step 1: Make 2 macros.
First macro (I called it “start level”):
G1029P7 ; set to 7 point leveling
G1029A ; run auto leveling
Second macro: (I called it “save level”):
G1029S ; save level
G1029D0 ; store level
G28 ; go home
Step 2: Set the bed temp to the temp you’re going to print at. Let it get to temp and sit there for maybe 5-10 minutes.
Step 3: Run the “start level” macro, it’ll take about 10 minutes, the tool will probe the bed in an 7 by 7 grid, doing a concentric square to the center. It’ll then stop, hovering just a bit above the center of the bed.
Step 4: set the bed temp to the temp you’re going to print at again
Step 5: Using the touch screen, go to the “control” app, and move the head down, probably moving in 1 or .1mm adjustments. This is where you use the calibration card to make sure that it’s just barely gripping it. I’ve found best results are when it grips it, but you can still slide the card in from the front (the original instructions say it should bend when you try to slide it in, I found that produced too low of a z level for me).
Step 6: run the “save level” macro, the head will return up to the top left of the machine, and the bed will come all the way forward.
Optional step 7 (only possible if you’re not using octoprint to run your prints): Print using at least a skirt, or maybe a full brim, and while the skirt/brim prints, use the tablet to do a fine adjustment to the z level until you get the “best average first layer”: https://ucarecdn.com/03426f33-4996-460a-afd3-21be58163f1e/-/format/auto/-/preview/3000x3000/-/quality/lighter/