DOI: 10.1002/ejoc.200800232 (M. Lang et al., European Journal of Organic Chemistry, (20), 3544-3551; 2008. Wolfgang Steglich is a coauthor)
I did a quick SciFinder search and I found a synthesis of benzene-1,2,4-triol from its tris-acetylated precursor. They worked under argon, and they used a slight excess of hydrazine, with methanol as their solvent. They used 2 M HCl in their extraction (probably to remove hydrazine and its by-product, as I noted above) and dried the combined ethyl acetate layers with sodium sulfate.