The Splashing mechanic is a type of IRecipeManager and implements all the methods that are available to IRecipeManager's, such as removeRecipe() and removeAll().

The following script will add a recipe that will output a Diamond and an Apple 45% of the time when a piece of Dirt is Splashed with a duration of 100.

ZenScript
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// <recipetype:create:splashing>.addRecipe(String name, MCWeightedItemStack[] output, IIngredient input, @Optional(100) int duration)

<recipetype:create:splashing>.addRecipe("splashing_test", [<item:minecraft:diamond>, <item:minecraft:apple> % 45], <item:minecraft:dirt>);

The following script will remove all Splashing recipes that output Yellow Concrete.

ZenScript
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// <recipetype:create:splashing>.removeRecipe(IItemStack output)

<recipetype:create:splashing>.removeRecipe(<item:minecraft:yellow_concrete>);