Corrosion may be caused by an improper cleaning procedure, testing of corrosive materials, a device under test, or from rust deposited from ferrous material of test fixtures.
Wash the test chamber's interior regularly with mild soap, particularly following any exposure to acid or other highly corrosive compounds.
Do not clean with steel wool or permit ferrous materials to rub on stainless surfaces.
If you do, particles of iron will be embedded in the stainless surface and cause rust. Gummy deposits, if allowed to remain, may result in electrolytic action and pitting.