Hi Joanne,
Following on from Jane's ever useful advice
you could try putting a rubber car mat on the table for Jenna to stand on, or if you don't have a spare one of those a bath mat or dampened towel will also give her something to grip on and should stop her from sliding around. Hopefully making it easier for you to clean her ears.
Its amazing what a 'firm' voice can achieve, which won't be difficult after being nibbled if Jenna's teeth are anything like Otis's
. He's very good at being groomed but he has 're-designed' my skirting board in the kitchen whilst he's been teething
. So it's back to being in the cage when I'm out. As they say 2 steps forward and 1 step back, but overall he is very good and he'll get there in the end