Yes there must be a drain running along the side of the house as the kitchen sink drains into a gulley at the side wall. However the drain is below a disabled concrete ramp and would need to break up concrete to access drain
A.long piece of 2x1 with some nails in the end is often used.You can get a garden tool with a long metal handle and a claw on the end, I think it is intended for disabled people to do weeding. There may be better tools and techniques others have used.
And sometimes notA.long piece of 2x1 with some nails in the end is often used.
or a cheap borescope plugged in your mobile phone - no need for 1930's technologyWith a torch and a small mirror you will be able to see further up and down the cavity look esp. for snots on cav ties,
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