求翻译：污渍的确定要有一个过程，去渍药剂的类别应先温柔后强烈。药剂的浓度要由低渐高。温度是化学反应的重要条件，如需要升温要缓慢。机械力也应由小渐大，但不能过大，应以温柔为主。使用刷子应以拍打为主；使用刮板应以挤压为主，“刮”和“铲”的机械力较大。是相对危险的操作方法。所以，去渍不要急于求成，任何一个过于强烈的去渍条件都会带来负面的影响，所以去渍的过程应先弱后强。是什么意思？

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