Boiler cleaning and repairs in Dell are taken up by several companies, which use chemical processes to eliminate scale and deposits from the boiler and its internal passages. The companies also clean tanks, exchangers, piping and other equipment. In order to clean the boiler, the companies use acid and alkaline based solutions. If a repair is detected, they rectify the problem or replace the part. Most cleaning/repair companies are capable of servicing nearly all brands and makes. Some of the factories take up regular maintenance/cleaning of boilers on a contract basis. Preventive maintenance inspections are also availed by the factories