I’ve groped mine out in the past when I couldn’t get a squirt out (!). As said above it’s behind the LH bulb hatch, upwards and behind the insulation. Have a grope about and you’ll find it and can drag it towards the hatch. If it’s blocked I found that putting a tyre pump on the pipe at the pump clears them, the pressure jumps to 40psi and then drops to 10psi when the flow starts. I found my lung power wasn’t enough to blow them through but once they’re clear they stay that way. I suspect non-use gums them up when the detergent dries out.