Okay..at all
DVC's points stays work like this:
If staying less than 8 nights, you will get trash-n-towel service on day 4 (which means no daily mousekeeping and on the 4th day of your stay they will come and empty the trash cans,give you fresh towels and replenish supplies like toilet paper,tissues and such). If you need your towels washed and you're staying in a studio, you can use the laundry facilities in the resorts for free you just need to bring your own detergent(Tide tablets travel well) or you can buy detergent in the gift shops or nearby grocery stores off sight. If in a 1bdrm or larger, you'll have a washer and dryer right in your villa. You can get an extra towel pack if you wish for a fee of $6 per pack for 4 people (I believe) which includes bath towels,hand towels,wash clothes and bath mats for 4. But why buy them when you can wash them for free (JMO). You can also get daily maid service for a fee per day of around $25 per day for a studio? Not sure if that's the exact price.....someone will post and clarify though I'm sure

But again, I personnally wouldn't want to pay for it...and don't really care for having the maids banging on the door in the morning to get in to clean.
If your stay is more than 8 nights, you'll get a full cleaning on day 4 (Trash-n-towel, plus they'll vacume,dust and change out bedsheets) and then Trash-n-towel on day 8 and the cycle repeats every 4 days.
As for garbage bags, there are usually extra's underneith the bag already in the trash baskets - if not, just call housekeeping and they'll bring you extra's. There are trash closets to empty them in the resorts.
Haven't stayed at SSR yet but have stayed in studio's at OKW,BCV's,VB and they're all great....I'm sure you'll love it.
HTH's and have a great trip!
