To remove brown stains from using Axie Aid that has spilled on on fabric, upholstery, carpet or furniture, make a paste of cream of tarter and 3% hydrogen peroxide (the consistency of pancake batter) and gently rub the stain. Stains will be lifted from most materials using this simple method. On the other hand, if it is the axolotl’s slime coat that has been stained brown, this will go away naturally as the cells slough off. It is an indication the treatment was too strong and should be reduced next time.