CITROEN 2 CV4 1975 Owner's Manual page 30

Cpmplex spot removers containing absorbent earths are also
obtainable: these have the advantage, when used properly, of not
leaving rings (e.g. "K2R").
Seat Belts
These should be cleaned with soapy water, or with water with a
little detergent of the "Teepol" type added, taking care not to touch
the metal parts. Remove the deepest stains with 90° alcohol
(commerically methylated spirits), or with lead-free petrol.
Do not dye the webbing as this may weaken them.
Dashboard Instruments
Use either soapy water, or diluted detergent, to the exclusion of all
other products.
Steering Wheel
Use soapy water or water with a detergent of the "Teepol" type
added. In no circumstances, use solvents such as alcohol, lead-free
petrol, or trichlorethylene.
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