Hi: When I started noticing the noise, the first thing they did to me in the workshop, was to grease the steering label, because they verified that I was dry. But the problem has continued. Days later they sprayed all the pieces that have the wheel (including suspension, shock absorber, etc.) with a spray and the noise disappeared for about 8 days but then returned.
The problem is that there can be several pieces with rubbers and as I have looked in some catalogs, the price of the pieces, in itself, would not be very high. The expensive thing would be the workforce of disassembling the old ones and setting up the new ones. Apart from that it does not make much sense to quize pieces that have no problem. Thanks for your comment.