can i use it everyday?

Unless you have super sensitive skin, you should be ok with daily usage

What is % of the Acid? Thanks!

I can't find the % of acid anywhere, but the pH is 9.54 (more basic than skin, which is 5.5). In my experience, it is fairly gentle. Ingredients are listed here:https://ryanraroar.files.wordpress.com/2015/02/cosrx-salicylic-acid-exfoliating-cleanser-pop-english-wishtrend.jpg

would this be good to use with a brush?

Hello, I used mine with a facial brush but not everyday, since I have sensitive skin. I did not experience any break-outs.

can this for oily skin

You can but I would recommend nooni snowflake cleanse . It's the BEST for oily skin. I recommend you get the 3 set: snowflake whipping cleanser micro whipping cream, nooni marshmallow whip maker and nooni snowflake cleanser (jesus island).

Manufacturer	Cosrx
Country of Origin	India
Item part number	B00OZ6W8DW
Product Dimensions	4.5 x 6.4 x 17.5 cm; 177 g
ASIN	B00OZ6W8DW

Cosrx Exfoliating Cleanser 15Ml

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