How to remove a stuck kitchen faucet nut

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   using a basin wrench
2. 2
   applying PB Blaster or WD-40
3. 3
   using a wire brush
4. 4
   trying to unscrew the whole fixture from underneath
5. 5
   digging around with a pick or pin to find a hidden grub screw
6. 6
   going in from below with a basin wrench
7. 7
   Checking and tightening the aerator
8. 8
   Checking the cartridges for damage
9. 9
   Applying plumbers putty around the pop-up lever
10. 10
    Replacing the existing nipple with a shorter one
11. 11
    Cutting back the copper pipe and sweating a new male adapter at the correct length
12. 12
    Hiring a skilled professional to modify the plumbing behind the wall
13. 13
    Asking for tips or tools to remove the stuck cartridge.
14. 14
    Watching YouTube tutorials
15. 15
    Cutting the old faucet out from the top using a reciprocating saw
16. 16
    Buying a new inexpensive faucet and replacing the entire unit
17. 17
    Using copper tubing, a torch with plumbing solder, and appropriate fittings to attempt a repair

In their words

Unedited, most upvoted first, each linked to the thread it came from.