I get a lot of shopping questions about where people can find environmentally-friendly household cleaning goods, etc. I do my shopping at Okoszolgalat (Ecoservice). Okoszolgalat is the coordination center for Hungary's environmental NGOs, and home to the Green Phone environmental hot line/help service. It also has a small shop attached called the <!-- pagebreak -->Zöld Zug. I get my tile floor cleaner, dish soap and wc cleaner from here. There are also many other products available such as recycled paper and paper products, and reusable diapers/nappies. For liquid cleaning supplies, bring your own bottle and they will fill it up for you. English is spoken. V. District, Nador u. 34 (near Parliament), in the courtyard directly across when you enter the building. tel: 311-7855
Open Monday 8-17, Tuesday-Thursday 8-16, Friday 8-14

There was also a green baby products store called Zizi that closed its doors last year but went on-line. Unfortunately, I cannot find any sign of them at the moment except this article on Caboodle.
http://www.caboodle.hu/nc/news/news_archive/single_page/article/11/nappies_that/