Hi GDTQA,
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Welcome to the IFSQN forums.
The need for allergen-specific test kits for validation will depend on the allergen content of your products.
If you have soy, wheat, and sesame in all your products then the allergen content should be declared on the label and there is no need for validation that an allergen has been removed between products.
When you have products that contain different allergens then this is when validation is required.
For example if you produce a product containing soy, wheat, and sesame and then your next product only contains soy then you need to ensure that you have effectively removed wheat and sesame content before that next product is run. This can be validated using both wheat and sesame allergen-specific test kits after your clean and before you run the soy only product.
I would also get the first off soy only product analysed by an outside laboratory to confirm that wheat and sesame content are below threshold levels.
Kind regards,
Tony