Here's an idea:
Listen to a handful of LP's. Then clean them and listen again. You may then decide for yourself, not ask others what you should do.
If you DO decide cleaner records sound better than non-cleaned ones, you can get your LP's far cleaner with a vacuum-style cleaner than you can with the Spin Clean. The vacuum machines offered by Record Doctor, VPI, Pro-Ject, and a few others offer great cleaning at a reasonable price. And for around $500 you can assemble an ultrasonic cleaner, which some prefer to vacuum cleaners.