I've used a de-esser (spitfish from digital fish phones) in the past to help reduce the level of slide noise. Also some highly-zoomed (and quite tedious) WAV editing in Sound Forge (or other WAV editor of choice).
I do think that if you just try to filter the noise out via an EQ filter, you might be EQing out some wanted harmonic frequencies, thereby altering your tone in a possibly negative way.
The best advice has been offered above: replace your strings (both size, type), a bit of the finger-ease and a bit of practice on your parts, then re-record.
Best,
guitardood