1.To open all cover for the drain line at basement and clean them.
2..To clean the drainage line and sump pits by transferring all wastage into the plastic bags. 
3.To use high pressure water between the drainage line connections.
4.To remove all wastage like Sands, muds and other wastes if have insides.
5.To use plastics pipe for removing any blocks if have insides the connections.
6.To apply chemical to solve drain line blocks and to remove Bad smells.
7.To take the plastic garbage out and throw out of the hotel.