Rot Steeping: This is an oldest method of desizing. In this method no chemical is used. Under this, the fabric which need to be desized, is stored in water at 40-60 degree C for overnight. Due to reaction with water, starch based sizing material get dissolved. 

                                   Padding            Storing                Washing

In this process fabric is first padded with warm water for 100% pickup and then kept for 12-24 hours. During that process microorganism present in water get multiplied and generate starch hydrolyzing enzymes. These enzymes break down starch and dissolve it in to the water. Finally cloth is washed. This process has following two main draw backs. 

1. Process is time consuming and 
2 One can not be sure that in the overnight dipping in water would remove sizing material completely.
3. Requirement of big space 
4. Some time mildew generated during processing attack the cloth and leaves stains

Acid Steeping: In this process acid is used to hydrolyze starch in to lower molecular weight glucose. The most common acids used in this process are Sulphuric and hydrocholoric acids. Fabric is treated 0.25 to 0.50% acid at room temperature around 30 to 40 degree C. To perform this process fabric is padded in acid and then stored for around 12 hours after that fabric is washed.

This process is also economical. There is no need for adjusting pH. The sizing material is removed completely. It take less time than Rot steeping.

The main disadvantage  associated with this process:

• If the material dried during storage the concentration of acid concentration increases which results tendering of cellulose material.