Miele PG 8536 Operating Instructions Manual page 48

Chemical processes and technology
Reaction between chemical agents and soiling
Problem
Natural oils and fats can be emulsified
with alkaline chemical agents. This can
lead to a heavy build-up of foam.
Soiling containing high protein levels
such as blood can cause a heavy
build-up of foam when processed with
alkaline chemical agents.
Non-precious metals such aluminium,
magnesium and zinc can release
hydrogen when processed with very
acidic or alkaline chemical agents
(oxyhydrogen reaction).
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How to resolve it
– Use the OIL program where available
or an optional "Oil" program defined
by Miele Service.
– This special program dispenses
cleaning agents containing tensides
(pH neutral) in the pre-rinse.
– Depending on application use
de-foaming agents that do not
contain silicone oils.
– Select a cleaning program with at
least one short pre-rinse in cold
water.
– Please observe chemical agent
manufacturer's instructions.