Door rubber seals - Which product (Sonax, Nextzett, BMW, Caramba)?

Black streaks from new rubber seals

Door rubber seals - Which product (Sonax, Nextzett, BMW, Caramba)?, Page 2

How to Recondition Weatherstripping with Sonax GummiPfleger Rubber Protectant

How-to: Protect Door Gaskets with SONAX GummiPfleger

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SONAX Rubber Protectant GummiPfleger 100 mL

Sonax Rubber Protectant (GummiPfleger) cleans, refreshes and restores rubber components and seals to maintain their elasticity and extend life Quick

Sonax 03401000 Rubber Protectant GummiPfleger, 3.38 fl. oz. , black

SONAX GummiPflege Soft top rubber seal lubricant

How-to: Protect Door Gaskets with SONAX GummiPfleger

How-to: Protect Door Gaskets with SONAX GummiPfleger