Autoglym Engine & Machine Cleaner
Price: £11.95 Size: 1,000ml Rating: ★★★★★ Contact: 01462 677766, www.autoglym.com
OFTEN, ‘green’ products trail less ecofriendly versions on performance, but not here; the water-based Engine & Machine Cleaner had a clear edge.
It topped all the tests, showing really well on grime from painted surfaces. However, you still need to check it is okay on plated metals. Its litre pack makes it more economical than WD-40, but it can’t match Comma’s keen price.