Vinyl & Cartridge Cleaners

The Magic Eraser and a dry brush is probably all the stylus cleaner you'll ever need, for next to no money. It's kept hundreds of cartridges as clean as new for over two years. Read the instructions Rushton linked to carefully, it's important to brush afterwards, just like eating! ;-)

AIVS makes a one-step cleaner that works pretty well. It's not as effective as their multi-step cleaners but it's way better than just dry brushing.

Vacuuming after wet cleaning is pretty important, otherwise you're just dissolving dirt and shoving it around. The least expensive purpose built machine is sold by KAB. It attaches to your existing household vacuum. DIY machines can be made for even less, though they're a bit slower to use. Do a search and you'll find hundreds of posts.

I built a rcm using a shop vac (29 dollars), old turntable from a deal i made on a record collection (10 dollars) and a strip of felt. I have experimented with several of the commercial cleaners except walkers (enzyme) and find a home made version works as well. lots of strings about diy homebrews or the commercial juice. both are pretty cheap in the long run. I do plan on trying the walker on a couple of records I really want to play but have too much gunk (stylus still picks up gunk after cleaning multiple times with a variety of cleaners)
A good brush and the vacuum are in my opinion, the best improvements in record cleaning. I have not used the walker brushes but can recommend the disk doctor brush. the microfibers do very good. Reminds me of my old discwasher i have used for 30 years. Good luck and keep spinning

For stylus cleaning, using Dougdeacon's recommmended process for employing the "Magic Eraser", try slitting the eraser vertically at 2-3mm intervals across its width.