On my way to the ghost signs walk around Stoke Newington, I jumped off the bus early to photograph this advertisement for Marshall's Lysol. It reads 'Ask for Marshall's chemists brand Lysol. [It's the?] genuine'. Unfortunately, the sign is partly obscured by a vinyl advertisement for a minicab company - itself somewhat vintage, judging by the '01' telephone code.
Lysol is a brand of disinfectant, and Marshall's seem to have marketed under the name 'Marshol' as well as Marshall's Lysol. The Lysol brand was founded in Germany in 1889 but soon gained worldwide popularity. It was so toxic that drinking Lysol was a not-uncommon method of committing suicide - London poet Charlotte Mew killed herself this way in 1928 - and was advertised in the United States as a (dangerous, ineffective) method of birth control. Lysol remains a major brand in the USA, now owned by Reckitt Benckiser.