intego good for cleaning imac

AFAIK, there are no "good" apps for cleaning a Mac. macOS does an excellent job of keeping itself tidy, and no "cleaner" apps should be needed.

If you have a situation where you used your Mac for awhile and have built-up a lot of cruf, I would suggest that you first back up your Mac, then use Recovery Mode, to erase its internal drive, and then, reinstall a "clean" copy of macOS.

Nope' third-party cleaners will mess up your iMac and make it unstable or worse unusable.

If you need to free up disk storage space, see > Free up storage space - Apple Support

If you need to free up a lot of space, consider moving your Photos or Music Libraries to an external drive.

see > Move your Photos library to save space on your Mac - Apple Support

and > Change where your music files are stored on Mac - Apple Support