Reflexives as subjects?

[Frans Plank]

I've once (in Studies in Lg 17, 1993) been puzzling over reflexives (if
this is what they are) in such passive constructions as these, permissible
for (many) speakers of German (and a few other languages):

Wird sich taeglich gewaschen?
is.3SG REFL daily washed
'Does one wash oneself daily?'

Hier wird sich nur von mir die Haende gewaschen.
here is.3SG.SBJ REFL (3rd person) only by me the hands (ACC=NOM) washed
'It's only myself who washes his hands here'

I found them odd with respect to control:  only subjects are supposed to
control reflexives, while here the (semantic) controllers would seem to be
the agents (usually indefinite and omitted).  But then grammatical
relations aren't so obvious in such passives in the first place (as shown
by uncertainties in verb agreement and case marking).

Maybe the reflexives themselves are the grammatical subjects of such
passives, instead of being morphosyntactically controlled by the elusive
dummy subject ES 'it'.

Frans Plank