This may seem random - but when I was packing for backstage facials at LFW yesterday it occurred to me that some of our gear may be useful to you also. Gauze is used regularly to give professional peels because its lighter, it takes up less product (thus saving you money) and isn't abrasive like some cotton can be. I use it to apply acid toners for the same reasons. Once you go gauze you can never go back
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You can find ones suitable for toners on Amazon here: amazon.com and you'll be able to pick up similar in any pharmacy.
If you accidentally buy them too big, cut them in half. We've all been there.