Strontium isotope analysis (⁸⁷Sr/⁸⁶Sr) has been employed as a provenancing tool for archaeological wool textiles. To date, the effect of post-depositional (soil burial environment) contamination on keratin samples, which contain ~ppm concentrations of Sr, has not been rigorously investigated. We compared published methods for removing exogenous Sr from keratinous textiles, using either: (1) compressed N₂ gas, (2) HF(aq) solution (with and without a strong oxidising agent to remove dyestuff) or (3) organic solvents. ⁸⁷Sr/⁸⁶Sr ratios and Sr contents were determined in undyed and madder-dyed/alum-mordanted moieties of the same wool textile, buried for up to three years in contrasting environments (marine sediment/fenland bog), and two archaeological textiles recovered in Iceland (one typical and one atypical of local manufacture). Undyed experimental samples had low Sr contents (0.07-0.29ppm) that were increased by both dyeing (0.14-8.92ppm) and soil burial (0.11-15.01ppm). The efficacy of Sr removal was: HF(aq)+oxidising agent>organic solvents>HF(aq)>compressed N₂. Unburied samples showed little variation in ⁸⁷Sr/⁸⁶Sr ratio between cleaning methods (0.00006-0.00035); buried samples showed greater variation (0.00257-0.00713). Archaeological samples showed Sr contents greater than experimental soil burials (1-118ppm), and ⁸⁷Sr/⁸⁶Sr values consistent with Icelandic groundwater (0.70357-0.70540). No cleaning methods retrieved original (unburied and undyed) ⁸⁷Sr/⁸⁶Sr ratios except treatment with compressed N₂ in undyed samples. Exogenous Sr from the short term soil burial environment is probably mostly present as particulates. We conclude that ⁸⁷Sr/⁸⁶Sr ratios of archaeological wool textiles recovered from wet burial environments do not accurately reflect wool provenance even after cleaning with the methods investigated.