noun
swab fluid; wiping solution
Medical term for a liquid used to moisten a swab or wipe a surface, often for specimen collection or cleaning.
検査の前に、ぬぐい液で患部を拭いてください。
Before the test, please wipe the affected area with the swab fluid.
消毒液 is a disinfectant solution for killing germs, while 拭い液 is specifically for wiping or swabbing, not necessarily disinfecting.
Compound of 拭い (the continuative form of 拭う, 'to wipe') and 液 ('liquid').