Question 1

Can you mix hydrogen peroxide and vinegar?

Accepted Answer

Use them sequentially, in two separate bottles. Virginia Tech food scientist Susan Sumner found the sequential spray killed far more Salmonella, Shigella and E. coli than either alone [13]. Premixing forms peracetic acid, which irritates eyes and airways [14][15].

Question 2

What percent should I buy?

Accepted Answer

3%. Every ratio here assumes it, and stronger brings handling risk with no household benefit [5].

Question 3

Is food grade hydrogen peroxide safe to drink?

Accepted Answer

No. The label describes purity, not edibility [18].

The FDA advised against ingesting high-strength peroxide in 2006 [19].

Question 4

How long does it need to sit to disinfect?

Accepted Answer

Keep the surface visibly wet for the full contact time. Some EPA-registered peroxide products work in 3 minutes [2]. Five minutes is a safe household default [5].

Question 5

Why is mine not working?

Accepted Answer

The bottle is flat, the surface was dirty and consumed the peroxide, or you wiped before the dwell time ended.

Question 6

Does it expire once opened?

Accepted Answer

Yes, within about six months. Use the potato fizz test.

Question 7

Can I gargle it daily?

Accepted Answer

No. Two or three times weekly at 1 part peroxide to 2 parts water [4][10].

Question 8

Is it septic safe?

Accepted Answer

At household 3% volumes, yes.

Question 9

Can I use it on plants?

Accepted Answer

Yes, 1 ounce per quart for root rot [4]. Stronger burns root hairs.

Question 10

Does it kill mold for good?

Accepted Answer

It kills what it touches. Mold returns if the moisture stays, so fix the leak or the ventilation.