With this small amount of background information on the situation, comments are: * If you let adhesive cure on your stencil, you should not be using Zestron 301. A hammer and chisel is more effective. * Assuming you are not letting the adhesive cure, is Zestron 301 recommended by your adhesive supplier? * Assuming Zestron 301 is a recommended cleaning agent, are you following the recommended practices for pump print stencils from Zestron, like: http://www.krepro.no/vask_rens/stencil_pump_print.pdf
* Search the fine SMTnet Archives for previous postings on the topic, like: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=20839
* Although more oriented towards paste cleaning, review IPC-7526 - Stencil and Misprinted Board Cleaning Handbook here: http://www.ipc.org/html/IPC-7526.pdf
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