Bought one from the last popular deal and lately I've noticed this terrible smell from the lid of our nutri ninja blender lid.
Carefully picked the rubber seal/gasket out and the smell was unleashed upon the entire kitchen like a thousand dead cockroaches. Heaps of mould, vege/fruit fibres, gunk and general shite got dislodged and I had to soak and disinfect the whole thing till it was actually bearable to handle without pinching my nose.
Looking at the design in retrospect, it's a really silly one. If you can't get to the seal to clean it then IMO it's a bloody health hazard and this blender is not fit for purpose - if it can't make a juice without smelling like death.
We have been using it on a daily basis over the last 4 mths and even if Nutri ninja DID provide (which they don't) a brush small enough to get into the threads of the lid, this is still a design flaw as the gasket itself is about 10mm in depth and this is heaps of surface area for gunk to get trapped in and start to decompose.
Did a big of googling and found only a handful of people on amazon with this same issue. I'm wondering if any of us ozbargainers have experienced this, how you have been cleaning your blender blade lid, or if you have any solution to this?
Also on a side note our blade has begun to develop very minute rust spots right at the bottom and I'm currently trying to get it replaced by the company. Closely inspecting the blade was what drew me to the smell… If you guys are trying to do the sniff test please watch where the blades go, you don't want them in your eye/nose.
10mm depth gasket… sounds like a job for the humble toothbrush.
The bad smell is from bacteria that is growing. Kill off the odor-causing bacteria by soaking in acid — white vinegar being the cheapest option.