I am dipping my film in a solution of 30g/L sodium thiosulfate to 'clear' my highlights after bleaching. My gut tells me that I need to use vigorous/continuous agitation to maximize my eventual Dmin while preserving as much Dmax as possible. The idea is to check the film every 15-30 seconds and once the specular highlights are as clear as the film base, remove it and wash it off. When I let the film sit in the hypo undisturbed, it seems to dissolve the areas with the most remaining silver halide (unexposed) more preferentially than it clears areas with less (i.e. highlights). The result is a muddy, low contrast image. Thoughts? Is there any chemistry to support this or am I imagining this problem? Does the agitation amount/type/frequency really matter here?