Is this liquid flammable?

It will burn through your wallet since it's so overpriced. I've never tried putting a match to it but I doubt it. It's just water-based citrus degreaser, maybe with a surfactant. Here's a link to the safety data sheet which doesn't seem to indicate that it's flammable. https://www.parktool.com/assets/doc/product/CB-4_SDS.pdf

Can you use this on painted carbon fiber bikes? The bike is a Scott Genius 700.

I'm sure you can. However it's ridiculously overpriced, doesn't work any better than citrus degreasers from Home Depot.

What best product to use clean chains with chain cleaner machine ?

I use this product along with the Park tool chain cleaner and have had good results. The chain comes out looking new with no grime or detergent left behind.

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🌿 Clean smarter, ride smoother — the green degreaser your bike deserves!

PROLONGS GEAR LIFE - Regular use reduces wear and friction, extending the lifespan of your gear system and enhancing performance.
PRECISION CHAIN CARE - Eliminates stubborn grease build-up to keep your bike’s drivetrain running smoother and shifting faster.
USER FRIENDLY DESIGN - Spill-free flip-top lid ensures clean, controlled application every time—no mess, no waste.
VERSATILE DEGREASING - Not just for chains—perfect for all your bicycle components, making maintenance effortless and efficient.
ECO FRIENDLY POWER CLEAN - Harness the natural strength of a 100% biodegradable, plant-based formula that’s tough on grime but gentle on the planet.

Park Tool CB-4 Bio Chain Brite is a 16-ounce, 100% biodegradable, plant-based degreaser designed to remove tough grease and grime from bicycle chains and components. Its spill-proof flip-top bottle ensures easy application, while regular use helps reduce gear wear and friction for smoother shifting and longer-lasting performance.

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