No problem at all, but it really depends on how hard your water is. I'm sure one of the other forum experts can vouch for vinegar (since I don't use any in my wash). Some people just put a Downy Ball full of white vinegar in it and let that do it's thang as a final rinse to the laundry (as softener).
As for baking soda, for a full load in a top loading washer, here's what I do (these are approximate measures, I kind of eyeball it, it's not really a science, it's just what works for me in Atlanta's hard water). Note also that I use mostly cold water, and on a few occasions, warm. I only use hot for stuff that has dog poo on it or I am totally grossed out and want extra bacteria killing action (my dog is a sickly one, sorry):
If using detergent (I use Arm & Hammer perfume/dye free):
Depending on amount of soiling:
- Really soiled (dog messes, etc): Warm to Hot water; full cap of detergent, 1/4 cup baking soda
- Semi-soiled (spilled food, that time of month, sheets that guests have used etc): Cold water for most, perhaps warm water for guest sheets; 1/2 capful of detergent, heaping 1/2 cup of baking soda
- Not soiled much at all, just normal wear and toss (includes sheets that I've slept in): Cold water; heaping cupful to 1 and 1/4 cup of baking soda only.
For things needing some major stain help (grease, clothes that I spilled large amounts of food [dropped a lot of sauce with turmeric in it on the way to a picnic] dog vomit, towels that I had to clean up messes and are soaked, that I haven't gotten around to):
- In a Rubbermaid cleaning bucket, pour hot water and two scoopfuls of Oxygen Bleach (I have a huge-ass box of OxyClean from Costco) and let my soiled stuff sit in the bucket overnight. When I get to it, toss in laundry, add more OxyClean to hot water, a little detergent, and if I feel like it, some baking soda, and see what happens. Wash again if stains don't come out.
- Carpet cleaning, dog diarrhea (yeah, that was NOT fun): Clean up what I can with paper towels and throw away in trash. I filled a plant waterer container with hot water and OxyClean and a squirt of Dawn. Shake the watering container a little to dissolve and mix everything. Soak and saturate the entire carpet with goop on it. Use paper towels to scrub clean. Next day, when carpet is more dry, vacuum to revive the pile of the carpet.
- General carpet cleaning, using a rented steam cleaner from Publix/Kroger: Hot water and 3 or more scoopfuls of OxyClean. Works GREAT.
Honestly, it depends on my mood that day and the more detergent I use, the less baking soda, and the more baking soda, the less detergent I use.
Again, I'm not an expert on this, but it's just stuff I've come up with to deal with my everyday laundry and stained items. I realized that most stains are better washed with cold water - warm or hot usually sets stains or gets rid of some parts of the stains and leaves residual portions and kind of 'seals them in'.