Just use contact cleaner for electronics. I’ve got all my original joycon analog sticks working on all 4 Switches in my house without issue.
It takes almost no time, and you don’t need to open up your controller and risk losing/damaging parts. It’s not permanent, but you only have to do it 1-3 times across the period of a week every two years or so.

See Nintendo doesn't need to do anything since we now have a solution that is perfect for the Switch.

I fixed my drift (left con) by bashing the stick really hard in the opposite direction to that which it kept drifting towards. Probably not to be recommended, but it did fix it and never a problem since - and I’ve played over 600 hours since.

Joy con drift is caused by residue getting caught up, some people have fixed it simply by blowing into it with straws - something like compressed air is probably safer, but better yet would be contact cleaner, which is significantly more effective. What you did was probably dislodge whatever was causing the problem… not what I’d recommend but it did the trick.

I can confirm that this was quite effective for me.

After I applied contact cleaner I haven't had drift for several months.