Can thermal paste or alcohol damage the CPU/GPU or PCB inside a laptop?

I plan to remove thermal paste from my CPU and GPU on my Acer Nitro 5 AN5155-53.

I’m going to use paper towels to wipe off the thermal paste, and then dip cotton swabs in 99% isopropyl alcohol to finish the job on the CPU & GPU as well as the leftover paste on the heatsink.

If I ever noticed there was too much thermal paste and it was spreading onto the PCB or outer edge of the CPU, will that cause any damage to the CPU/GPU or PCB?

Is there any chance of the alcohol damaging either one as well? Do laptop GPU or CPU have IHS?

Here’s what it looks like on a video: https://prnt.sc/1ysw1ks

I’m also curious what this person means by not putting alcohol on a “raw” CPU, does this not apply for a laptop? How do I clean my computer using isopropyl alcohol?

“It can be used freely on the motherboard, fan and thermal paste, but not on the raw CPU, RAM, add-on cards, CMOS battery and of course disks.”