I use histoclear in the last step of dehydration and have no problem with the arm picking up the slides. If I leave the slides for more than one hour in the last histoclear and if the histoclear covers the labels, then the glue of the label dissolves and interferes with the arm picking up the slides. Also If the labels are not places carefully on the slides and stick out from the slides then the arm has difficulty picking up the slides. Make sure your labels are placed carefully and use histoclear. If you have to use xylene make sure the xylene level is not very high so that It can affect the labels. 3 xylene changes 1 minute each is enough.
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