Cabin noise .. recommendations

Technical Area Body, Interior & Styling
1
  1. My model of MX-5 is: NC1

My car is only ever driven in nice weather and with the roof down. In the 10 years I’ve owned it, I bet I’ve driven it half a dozen times with the roof up.
I’ve always considered it to be a noisy environment, but as I rarely drive with the roof up, I’ve never bothered doing anything.
Any how, today, I plugged the bottom of drain tubes with a chunk of an old car sponge, and I can’t believe the transformation.
Considering I’ve effectively sort of plugged it and put it at risk of flooding, has anyone any recommendations for a fix where it will still allow water to escape.
I guess ultimately a proper fix is the correct thing to do, and maybe I may go down that route.

2

Use fuel tank foam - it is designed to allow fluid through it and not soak it up.

Should have the same effect without soaking up water.

3

I’d be concerned about stopping any dirt that goes down the pipe from getting out and then blocking the pipe.

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4

Following @RichardFX advice, I poured hot, soapy water down both drains in order to clear them of muck and debris.
What surprised me was a distinct reduction in road noise.
I presume this is because the hot soapy water cleared and cleaned the one-way, anti-noise, flap-valves and allowed them to seat properly.

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5

you could replace the valves fairly easily, the rubber tends to go hard or get stuck open