As of Mekanism 9.7.0 it is now possible to view all recipe strings of the Chemical Washer through the command /ct mekrecipes washer

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mods.mekanism.chemical.washer.addRecipe(IGasStack inputGas, IGasStack outputGas);

mods.mekanism.chemical.washer.addRecipe(<gas:deuterium>, <gas:tritium>);

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mods.mekanism.chemical.washer.removeRecipe(IIngredient outputGas, @Optional IIngredient inputGas);

mods.mekanism.chemical.washer.removeRecipe(<gas:cleanLead>, <gas:lead>);
mods.mekanism.chemical.washer.removeRecipe(<gas:cleanOsmium>);

Specifying an input parameter will only remove the specific recipe that uses said input. Omitting the input parameter will remove all recipes that produce the specified output.

As of Mekanism 9.7.0 it is now possible to remove all Chemical Washer recipes. (This excludes any recipes added via CraftTweaker)

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mods.mekanism.chemical.washer.removeAllRecipes();