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0:00 Let's start lesson 2! 0:34 Citric acid vs. rust 1:02 EXPERIMENT 1 RESULT 1:30 How to lubricate a chain 4:51 Effects of not lubricating a chain 6:35 Rapeseed oil for a chain? 8:35 EXPERIMENT 2 RESULT 10:39 Bike WITHOUT a chain 13:17 What about the new chain? 14:25 DO YOU KNOW THE ANSWERS? A brilliant degreaser that leaves a protective coating on the chain: https://szajbajk.com/2YcCxnv A product for removing mud and dirt from a bike: https://szajbajk.com/3th7cvp