Product review (5 stars): I changed the clutch and it worked for a couple days but stopped spinning again...
I put this clutch in my ten year old washer with a no spin issue and it worked for four days and stopped spinning again...

BUT, the problem is not a result of a bad or cheap part. When comparing the old and new clutch parts, they seem identical to me. After beating my head against a wall for a day or so I realized the problem was the result of build up depositing between the inner (metal) and outer (plastic) tub. This build up adds friction and slows the inner tub until it stops. If the machine was left running long enough it would have ripped up the new clutch in short order. Now that it has been cleaned out it spins really, really fast. Much faster than it has in the last year or so. It spins so fast that I plan on cleaning it out again in 2018 to prolong the unit's life. I'll do this in addition to the yearly cleaning of the dryer vent.

If you are confident enough to change the clutch, there is no reason why you can not clean out the gunk too. Search youtube for how to remove the tub. I know it is intimidating at first, but it is really easy. Easier than pulling the clutch, and if you have already changed the clutch then there is no need to even pull the washer out from where it operates and lay it down because you are completely done down there. If you do not have the special tool to remove the drive nut, just try using a metal punch and hammer. Do not use anything metal to scrape the tubs with! I used a small windshield ice scraper and it all came out pretty easy.