Windows 10/11 disk cleaner software for freeing up more space

My C drive has been showing red for weeks now, and I'm down to less than 20GB free on a 256GB SSD. The problem is, I've already run the built-in Windows Disk Cleanup a few times, but it barely made a dent. It feels like I'm just scratching the surface. I know there are tons of third-party disk cleaner software out there. But I've also heard horror stories about some of them being full of ads, bundled with unwanted software, or even accidentally deleting important system files. So I'm looking for advice from people who actually use these tools.